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Commit f2dec34e1 changed things so that printtup's output stringinfo buffer was allocated outside the per-row temporary context, not inside it. This creates a need to free that buffer explicitly when the temp context is freed, but that was overlooked. In most cases, this is all happening inside a portal or executor context that will go away shortly anyhow, but that's not always true. Notably, the stringinfo ends up getting leaked when JDBC uses row-at-a-time fetches. For a query that returns wide rows, that adds up after awhile. Per bug #15700 from Matthias Otterbach. Back-patch to v11 where the faulty code was added. Discussion: https://postgr.es/m/15700-8c408321a87d56bb@postgresql.org
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.